Road parting strip



A. A. KRRMER April 22, 1930.

ROAD PARTING STRIP Filed $131" A TTORNE Y.

'Patented Apr. 22, W39 I i UNITED. STATES PATENT oFFl cs ROAD raarnve swan Application filed November 14, 1927. Serial No. 233,179.

My invention relates to parting strips for sirable and suitable stifiening' formations for concrete construction and more particularly the strip are provided between the offset, to metallic road parting strips. socket formingportions. When theconcrete In the building of concrete roadways and is poured on the opposite sides of thestrip 6 more particularly in building a roadway that the resultant joint provides roundedspherical :55 is provided with reenforcing means, it is cusprojections and rounded spherical socket portomary to employ a metal strip embedded in tions receiving the projections with the prothe concrete so as to have the top edge thereof 'ections oppositely directed in alternating located below the top surface of the concrete. relation and with. the-metallic parting strip The purpose of the strip is to artificially form interposed between the two sections of con- 69 a crack over the same and thus prevent the crete. When the offset portions are spaced cracking of the concrete irregularly and also the projections ma be partly rounded, alto provide means for keyin the adjoining though not quite emispheres, thus being sections of concrete lying side yside together partly spherical, whereas if the ofiset por-f in the direction of the length of the roadway. tions are overlapped the. stiffening portions 65 Obviously the parting strips could be used merge with the spherical surface to; break for concrete construction of other characthe rounded contour thereof. ter and also could be extended transversely Other objects and advantages of my in'' or otherwise in the roadway as well as lengthvention will appear as the description of the wise. I drawings proceeds. I desire to have-it un- It is the purpose of my invention to proderstood, however, that I do. not. intend to vide a road parting strip of sheet metal that limit myself to the exact details shown or will more thoroughly key the adjoining secdescribed'but that I intend to include aspart I tions of the concrete together than has previof my invention all such obvious 'ch'anges 76 ously been the case. In the previously used and modifications as will occurto a person road parting strips it very frequently hapskilled in this art and as would fall Within pens that the portion of the concrete that the scope ;of the claims. forms a tongue is broken ofi, due to the weight In the drawings: v c of vehicles passing over the joint and as a Fig. 1 is a side elevation partly broken result the keying of the sections by means of away of my improved road parting strip. 8.

the parting strip is lost. I have found that Fig. 2 is a central longitudinal sectional by providing a plurality of relatively shalview of a portion of the str p shown in Fig. 1. low op ositely directed ofiset portions in the Fig. 3 is an edge viewthereof. I 1 strip, orming rounded sockets for receiving Fig. 4 is a view similar to Fig. 10f another correspondingly rounded projections of the form of. iy invention.

concrete and forming rounded projections Fig. 5 is a longitudinal sectional view of the receiving correspondingly rounded sockets in portionof the strip shown in Fig. 4 taken on the concrete, the road sections are more sethe line 5-'5 of Fig. 4. curely keyed together and the possibility of Fig. 6 isa section taken on the line 6-6 the projections being broken off is almost of Fig. 4, and v Q j entirely eliminated. Fig. 7 1s a'n'edge view of the strip shown in It is more particularly the purpose of my Fig. 4. T I i invention to provide a road parting strip with Fig.8 is a vertical sectional view through a I partly spherical offsets therein, adjoining'ofi'- portion of the concrete showing my improved P sets being oppositely directed so that each parting strip in position therein; 9 thereof forms a partly spherical socket por- Referring in detail to the drawings,- the tion on one side of the strip and partly spherroad parting strip shown in Figs. 1 to 3 inical projection on the other side of the strip. elusive comprises a sheet metal body portion These offset portions may be spaced or may 10 that is normally plane faced. Said sheet overlap as may be found to be the most demetal strip is preferably run through rolls to form the offsets thereon whereby the socket formations are formed Said offsets 11 are preferably oppositely directed as will be evident from Figs. 2 and 3 and comprise portions of surfaces of spheres less than hemisphef es. Partly spherical socket portions 12 are thus formed on the inside of the offsets, the outside of the offsets forming correspondingly rounded projections. It will be noted fwm Figs. 2 and 3 that the offsets 11 project on opposite sides of the center line of the strip so as to alternate lengthwise of the strip, thus a socket 12 opens first on one side of the strip and then on the other side of the strip lengthwise of the same. In order to stiffen the strip between the offsets 11 said offsets are overlapped slightly as shown in Fig. 1 and plane obliquely extending stiffening portions 13 are provided between adjoining offsets 11, the stiffening portions 13 extending obliquely in opposite directions as will be noted in Fig. 2. Due to the fact that the projections 13 extend obliquely to the main body portion 10 of the strip the same will stiffen the strip between the offsets 11. Said stiffening portions 13 merge with the curved surfaces of the offsets 11 as will be clear from the drawings. A row of alternating oppositely directed sockets is thus formed lengthwise of the strip. the outer surfaces of the strip opposite the sockets forming similarly shaped projections. Due to the gradually rounding surface of the projections and sockets, thus formed, concrete, which is shown in Fig. 8 and indicated by the numeral 14 will form itself in the correspondingly shaped socket portions 15 and projections 16, the strip 10 eing imbedded in the concrete with the upper edge portion 17 thereof spaced slightly below the top surface 18 of the concrete. The portions of the concrete on opposite sides of the strip will thus be keyed together by a chain of interlocking projections and socket portions, forming a continuous row or chain lengthwise of the strip. Due to the rounded nature of the formations the tendency of the same to break off will be considerably reduced and furthermore due to the tendency of the road sections to separate slightly transverse ly of the roadway the rounded projections will leave the socket portions in which the same are located to a less degree than would more sharply tapered projections upon separation of the opposed roadway sections. In other words there will be a larger cross-section of the projection still engaged-with the socket in the rounded form than if a more angular shaped form of projection or rib were used as has previously been the custom. As reenforcing rods are commonly used in the concrete roadways. openings or perforations 1.) are provided at the properly spaced intervals in the strip 10 to receive the reenf'orcing rods 20, said openings 19 being preferably located centrally of the offsets 11.

In the form shown in Figs. 4, 5 and 6 the offsets 11 are spaced to provide rounded partly spherical socket portions 12 in the strip 10 the socket portions being oppositely directed so as to project alternately on opposite sides of the strip as previously described, the projections are furthermore perforated at intervals to accommodate the reenforcing rods 20 as previously described in connection with Figs. 1 to 3 inclusive. Instead of providing the stiffening portions 13, considerably elongated offset stiffening portions 21 are provided between the socket forming projections, said stiffening portions 21 overlapping adjoining projections 11 slightly lengthwise of the strip so that the projections 21 and the socket forming projections 11 together act to stiffen the strip throughout the length thereof. Obviously the offsets 11 will operate in substantially the same manner as the offsets 11 whenthe strip is placed in the concrete except that the number of offsets in a given length of strip will be less than in the form shown in Figs. 1 to 3 inelusive.

It will be obvious that due to the projecting offsets on both sides of the strip and the corresponding formation of socket portions on both sides of the joint in the concrete, it will not be necessary to make the projections in a strip such as that shown in the drawings as great as is the case in a projection extending only on one side of the strip as the socket portions and projections will interlock on both sides of the oint.

Having thus described my invention, what I desire to claim and secure by United States Letters Patent is:

1. A parting strip having a plurality of closely spaced concavo-convex lateral offsets therein curved in all directions and forming a socket on one side of each thereof and a projection on the other side of each thereof opposite said socket, adjacent ones of said offsets being oppositely directed.

2. A parting strip having a row of closely spaced concavo-convex lateral offsets therein curved in all directions and forming a socket on one side of each thereof and a projection on the other side of each thereof opposite said socket, said offsets alternating to provide alternate projections and sockets on both sides of said strip.

3. A parting strip having a plurality of closely spaced concavo-convex lateral offsets therein curved in all directions and forminga socket on one side ofeach thereof and a projection on the other side of each thereof opposite said socket, and laterally offset connecting portions joining said socket forming offsets.

4. A parting strip having a plurality of closely spaced partly spherical lateral offsets therein forming a socket on one side of each thereof and a projection on the other side of each thereof opposite said socket, and laterally offset connecting portions joining the partly spherical offsets.

5. A parting strip having a row of closely spaced eoncavo-convex lateral offsets therein curved in all directions and forming a socket on one side of each thereof and a projection on the otherside of each thereof opposite said socket and relatively short sti ening formations between said offsets and overlapping the same.

6. A parting strip having a plurality of closely spaced concavo-convex lateral offsets therein curved in all directions and forming a socket on one side of each thereof and a projection on the other side of each thereof opposite said socket, adjacent ones of said offsets being oppositely directed, and relatively short laterally ofiset connecting portions joining said socket forming offsets.

7. A parting strip having a plurality of closely spaced concavo-convex lateral offsets therein curved in all directions and forming a socket on one side of each thereof and a projection on the other side of each thereof opposite said socket, certain of said offsets being perforated.

8. A parting strip having a plurality of closely spaced partly spherical lateral offsets therein forming a socket on one side of each thereof and a projection on the other side of each thereof opposite said socket, certain of said offsets being centrally perforated.

I 9. A parting strip having oppositely directed overlapping partly spherical lateral offsets therein each forminga socket on one side thereof and a projection on the other side thereof.

10. A parting strip having oppositelyidirected overlapping partly spherical lateral offsets therein each forming a rounded socket on one side thereof and a rounded projection on the other side thereof.

11. A parting strip having oppositely directed overlapping partly spherical lateral offsets therein each forming asocket on one side thereof and a projection on the other side thereof and inclined stiffening formatiorils between said offsets and merging therewit 12. A parting strip having a substantially plane top and bottom portion and a keying portion between said plane portions said keying port on comprising a plurality of closely spaced concavo-convex lateral offsets curved in all directions, each forming a socket one one side thereof and a projection on the other side thereofvopposite said socket,

said offsets alternating to provide alternate projections and socket portions on both sides of said strip.

13. A parting strip having a substantially plane top and portion keying bottom portion and a keying between said plane portions, said portion comprising a plurality of closel spaced concavo-convex lateral offsets curve in all directions, each forming a socket on one side thereof and a projection v on the other side thereof opposite said socket, said offsets alternating to provide alternate projections and socket portions on both sides of said strip and overlapping lengthwise of said strip to provide a longitudinally extending continuous stifiening formation.

In testimony whereof, I hereunto subscribe my name this 4th day of November,

1927. ANDREW A. KRAMER. 

